The video, released by the city’s emergency management agency, shows a lifeless computer-generated street, with damaged skyscrapers in the background. Mayor Eric Adams says he doesn’t think the video is troubling, telling reporters, “I’m a big believer in better safe than sorry.” New Yorkers are used to warnings about all kinds of potential threats, including severe weather, public health and mass shootings. A narrator says, “So there’s been a nuclear attack. Don’t ask me how or why. Just know that a big one has hit.” He is advising residents to stay indoors and wash away any radioactive dust or ash. Christina Farrell, the city’s deputy emergency management commissioner, said the video is not linked to specific threats and is only about raising awareness. “There’s no overarching reason why this is the time we sent it,” he said. “It’s just one tool in the toolbox to prepare for the 21st century.” Ms Farrell said the agency’s aim was to empower people about a scary subject and despite the mixed reaction to the video, “people have thanked us for approaching this issue”. Read more on Sky News: Hearing on Capitol Hill riots: Twitter staffer fears Trump tweet He added: “I don’t know if there is ever an ideal time to talk about nuclear preparedness.” City officials have discussed implementing nuclear guidelines for some time, Ms. Farrell said. New York’s emergency response program, Ready New York, has been in place since 2003.